Test uniqueness of cache per region

Added back from the old original commit which was later squashed with a
commit giving-up this uniqueness.

Author: fredericDelaporte

src/NHibernate.Test/CacheTest/BuildCacheFixture.cs

@@ -28,7 +28,7 @@ protected override void Configure(Configuration configuration)
 		}
 
 		[Theory]
-		public void CommonRegionHasExpectedConcurrency(bool withPrefix)
+		public void CommonRegionHasOneUniqueCacheAndExpectedConcurrency(bool withPrefix)
 		{
 			const string prefix = "Prefix";
 			const string region = "Common";
@@ -70,6 +70,11 @@ public void CommonRegionHasExpectedConcurrency(bool withPrefix)
 						Assert.That(relatedAConcurrencyCache, Is.InstanceOf<NonstrictReadWriteCache>(), "Unexpected concurrency for RelatedA");
 						Assert.That(entityBConcurrencyCache, Is.InstanceOf<ReadOnlyCache>(), "Unexpected concurrency for EntityB");
 						Assert.That(relatedBConcurrencyCache, Is.InstanceOf<ReadWriteCache>(), "Unexpected concurrency for RelatedB");
+						Assert.That(entityACache, Is.SameAs(commonRegionCache), "Unexpected cache for EntityA");
+						Assert.That(entityBCache, Is.SameAs(commonRegionCache), "Unexpected cache for EntityB");
+						Assert.That(relatedACache, Is.SameAs(commonRegionCache), "Unexpected cache for RelatedA");
+						Assert.That(relatedBCache, Is.SameAs(commonRegionCache), "Unexpected cache for RelatedB");
+						Assert.That(queryCache, Is.SameAs(commonRegionCache), "Unexpected cache for query cache");
 					});
 			}
 			finally

src/NHibernate/Cache/StandardQueryCache.cs

@@ -23,7 +23,7 @@ public partial class StandardQueryCache : IQueryCache, IBatchableQueryCache
 		private readonly CacheBase _cache;
 
 		// Since v5.2
-		[Obsolete("Please use overload with an CacheBase parameter.")]
+		[Obsolete("Please use overload with a CacheBase parameter.")]
 		public StandardQueryCache(
 			Settings settings,
 			IDictionary<string, string> props,

src/NHibernate/Cache/StandardQueryCacheFactory.cs

@@ -11,7 +11,7 @@ namespace NHibernate.Cache
 	public class StandardQueryCacheFactory : IQueryCacheFactory
 	{
 		// Since v5.2
-		[Obsolete("Please use overload with an CacheBase parameter.")]
+		[Obsolete("Please use overload with a CacheBase parameter.")]
 		public IQueryCache GetQueryCache(string regionName,
 																		 UpdateTimestampsCache updateTimestampsCache,
 																		 Settings settings,

src/NHibernate/Cache/UpdateTimestampsCache.cs

@@ -26,7 +26,7 @@ public virtual void Clear()
 		}
 
 		// Since v5.2
-		[Obsolete("Please use overload with an CacheBase parameter.")]
+		[Obsolete("Please use overload with a CacheBase parameter.")]
 		public UpdateTimestampsCache(Settings settings, IDictionary<string, string> props)
 			: this(
 				CacheFactory.BuildCacheBase(